#import<UIKit/UIKit.h>
#import "SecondViewController.h"
//遵循协议
@interface ViewController : UIViewController
@property(strong,nonatomic) UITextField *textName;
@property(strong,nonatomic) UIButton *btn;
@end
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.textName = [[UITextField alloc] initWithFrame:CGRectMake(100, 200, 100, 50)];
self.textName.borderStyle = 1;
[self.view addSubview:self.textName];
self.btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
self.btn.frame = CGRectMake(200, 200, 50, 50);
[self.btn setTitle:@"下一页" forState:UIControlStateNormal];
[self.btn addTarget:self action:@selector(NextPage) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.btn];
}
////实现协议方法
//-(void)postValue:(NSString *)info
//{
// self.textName.text = info;
//}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
if ([textField isFirstResponder]) {
[textField resignFirstResponder];
}
return YES;
}
-(void)NextPage
{
SecondViewController *second = [[SecondViewController alloc] init];
second.str = self.textName.text;
//实现代码块
second.myblock = ^(NSString *info){
self.textName.text = info;
};
[self presentViewController:second animated:YES completion:^{
NSLog(@"Next");
}];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
/* 代码块传值 从后往前传
1.声明代码块 （secondXXX.h）
2.声明一个代码块类型的属性 (SecondXXX.h)
3.调用代码块 (secondXXX.m)
4.实现代码块 (firstXXX.m)
*/
#import<UIKit/UIKit.h>
typedef void(^postValueBlock)(NSString *info);
@interface SecondViewController : UIViewController
@property(strong,nonatomic) NSString *str;
@property(strong,nonatomic) UITextField *textInfo;
@property(strong,nonatomic) postValueBlock myblock;
@end
#import "SecondViewController.h"
@interface SecondViewController ()
@end
@implementation SecondViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor grayColor];
NSLog(@"%@",self.str);
self.textInfo = [[UITextField alloc] initWithFrame:CGRectMake(100, 150, 100, 50)];
self.textInfo.borderStyle = 1;
self.textInfo.delegate = self;
self.textInfo.text = self.str;
[self.view addSubview:self.textInfo];
}
//3.调用代理方法
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
//1.调用block
if (self.myblock) {
self.myblock(textField.text);
}
//2.键盘隐藏
if ([textField isFirstResponder]) {
[textField resignFirstResponder];
}
//3.隐藏页面
[self dismissViewControllerAnimated:YES completion:^{
NSLog(@"dismiss");
}];
return YES;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end
